jayvdb added a comment.
checkBlocks is no longer used in core. There may be login related bugs in core for logging on from blocked IPs, but they will have a very different backtrace and solution. https://gerrit.wikimedia.org/r/#/c/209503/ will also further distance core from its compat roots.
TASK DETAIL https://phabricator.wikimedia.org/T57288
EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/
To: jayvdb Cc: Legoktm, jayvdb, Masti, Anshoe, pywikipedia-bugs